Walk the set of transactions on the ticket whose id you've passed in,
looking for updates by the 'current user' which happened after start_time and before now.
Then mark those transactions as ones that originated in SD,
so we don't accidentally push them later.

Given a transaction id,
will return true if this transaction originated in Prophet and was pushed to the foreign replica or originated in the foreign replica and has already been pulled to the Prophet replica.

This is a mapping of all the transactions we have pushed to the remote replica we'll only ever care about remote sequence #s greater than the last transaction # we've pulled from the remote replica once we've done a pull from the remote replica,
we can safely expire all records of this type for the remote replica (they'll be obsolete)

We use this cache to avoid integrating changesets we've pushed to the remote replica when doing a subsequent pull